The best way I can describe it is, before you experience anything like that, you are only aware of the normal/sober extents that your mind uses, and afterwards you realize that most the dials/knobs/gradients/ups/downs you've experienced are only within a small threshold of what your brain is capable of. Experiencing that allows you to have a better understanding of where your thoughts/emotions/experience fall on those spectrums the rest of your life. It puts the range you normally operate into perspective.
Think of it as a kind of messy recalibration, a jostle of the box of your mind. Jostling your box occasionally can help you sometimes break through a local optima to a more global optima, shaking the fuck out of your brain all the time, well, it'll probably make you creative but no guarantees anyone else will understand you.